The bridge, the stairs, and the tree

[Na.Irene]

I have been having these repeating locations in my dreams. Although, ive never seen them before. The dream isn't completly repeating, mostly the location. I've noticed that there's a connection to these places. When walking past the bridge into a building, that leads to the stairs. If you were to walk past the bridge, that's probably where the tree would be.

Dreams:
The flooding bridge, the waterless bridge, the bridge flooded with red (mud? Blood?)
Part of the time, it's flooded. Or, it's dry. Sometimes it's clear, once it was filled with... Blood? Whenever it floods, there's a chain ladder coming from the sky. I would be with someone, diffrent person at diffrent times. Even if the flood stops, I end up in the building- depressed.

Stairs in the building
Usually I'm going up. But in my path, there are some scary things. Sometimes I'm going down, the same thing. Sometimes, I enter from a tunnel. (seperate, but connecting dream.

Building in a seperate dream
I had one dream where I stayed in the building. I was with a blonde girl who appeared in a previous dream. In the previous dream, I was afraid of her. We were looking at rings, them she attacked me. (O///O)

Tree
In this dream, I'm going up a hill to a dream. When I do, I pass by several rows of occupied desks. The people only stared blankly into- well, blank space. After passing them, I go to this strange tree. A pink glow surrounds it, the cherry blossom tree? On the tree, a tree spirit rests. (I forgot the proper name... Starts with a d?) she only sits there, like the other people staring into the nothingness.
A ghost appears, pointing to her right- my left. As I walk with her, there's an over-sized ice chest. Inside, a dead girl. Once I open the box, a ghost flies out. Then, an empty void is left behind. (she's not me, diffrent hair color, ect)

So, what could this mean?